Development of Optical Disk Memories with a High Reflectance Using Metal Island Films

本研究的目的是利用由纳米金属团簇组成的金属岛膜来研制高反射率和大光学变化的光盘存储器。适合制作光盘的金属是银和铜。我们选择了银岛薄膜，并研究了它的记录特性。由于岛的热变形，在800 nm波长处加热可以使银岛薄膜的光学性质发生很大的变化。我们首次使用原子力显微镜(AFM)从实验上证实了这一点。我们还看到了以大约1微秒的记录速度进行激光写入。此外，还证实了埋在含氟橡胶中的银岛膜非常稳定。因此，我们认为银岛薄膜是一种非常有用的光盘存储介质。

The purpose of this study is to develop the optical disk memories with a high reflectance and great optical change by using metal island films composed of nanometer-size metal clusters. The suitable metals for optical disks are silver and copper. We have selected the silver island films and have investigated its recording characteristics. The optical properties of the silver island film can be greatly changed at the wavelength of 800 nm by heating due to the thermal deformation of islands. We have experimentally confirmed it by using an atomic force microscopy (AFM) for the first time. We have also seen the laser writing at the recording speed of about 1 mus. In addition, the silver island films buried in fluorine-contained rubber is confirmed to be very stable. Therefore we conclude that the silver island films are very useful media for optical disk memories.